What does Error Code P0355 mean?
Moderate Issue
DTC Code P0355 indicates an issue with the Ignition Coil 5 Control Circuit in vehicles with a generic ignition system. This code is triggered when the Engine Control Module (ECM) detects a mismatch between the commanded and actual state of the ignition control circuit for coil 5, affecting the spark event.
What are the symptoms of Error Code P0355?
- Engine Light ON: The check engine light or service engine soon warning light illuminates, indicating an issue with the ignition coil 5 control circuit.
- Lack/Loss of Power: The vehicle may experience a noticeable reduction in power, potentially linked to a malfunctioning ignition coil affecting cylinder performance.
- Engine Harder to Start: Starting the engine may become more difficult due to improper ignition timing or spark delivery from the faulty coil.
- Engine Hesitation: The engine may hesitate during acceleration, which can be attributed to inconsistent spark delivery from the affected ignition coil.
- Rough Engine Idle: The engine may idle roughly, possibly due to misfires caused by the ignition coil 5 control circuit issue.
What causes Error Code P0355?
- The ignition coil may be defective, leading to improper spark generation and engine misfires.
- There could be an open or short in the wiring harness connected to Ignition Coil 5, disrupting the electrical flow.
- Poor electrical connections in the circuit can cause intermittent or weak signals to the ignition coil.
- The Engine Control Module (ECM) might be malfunctioning, failing to send the correct signals to the ignition coil.
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How to fix Error Code P0355?
- Initial Inspection: Inspect the ignition coil for Cylinder 5 for any visible damage or corrosion. Check the wiring and connectors for signs of wear or disconnection.
- Check Power Supply: Use a multimeter to verify that the ignition coil is receiving the correct voltage. Ensure the power supply to the coil is within the manufacturer's specifications.
- Test Coil Resistance: Measure the resistance of the ignition coil using an ohmmeter. Compare the readings with the manufacturer's specifications to determine if the coil is functioning properly.
- Inspect Control Circuit: Examine the control circuit for any open or short circuits. Use a wiring diagram to trace the circuit and ensure continuity.
- ECM/PCM Check: Verify that the Engine Control Module (ECM) or Powertrain Control Module (PCM) is sending the correct signals to the ignition coil. Use a scan tool to monitor the signals and ensure they match the expected values.
- Swap Test: If the issue persists, swap the ignition coil with another cylinder's coil to see if the problem follows the coil. This can help determine if the coil itself is faulty.